Valve-truing device



W. S. ANDERSON.

VALVE TRUING DEVICE.

APPLICATION FILED APR. 8, 1918..

Patented Jan. 6, 1920.

, NILTED sT TEsf mu OFFICE.

WILLIAM s. ANDERSON, or VICTOBVILLE, CALIFORNIA.

VALVE-TBUING nEvrcE;

To all whom it may concern;

Be it known that 1, WILLIAM S. ANDER- soN, citizen .of the United States, residing at Victorville, in the county of San Bernardino, State of California, have invented new and useful Improvements in Valve-Truing Devices, of which the following is a specification.

This invention relates to devices for truing and reshaping puppet valves, particularly puppet valves of internal combustion engines which have become somewhat worn and have lost their proper and true circular conformation. It is an object of this invention to provide a simple, inexpensive and easily used device which may be used to quickly conform a valve.

Valves frequently become so worn that no amount of grinding of the valve upon its seat will cause the valve to seat properly; or an excessive amount of grinding is required which consumes a considerable time. It is an object of this invention to provide a device in which the valve itself may be first trued to perfect circular conformation previous to being ground into its seat. The invention will be best understood from the following description of a preferred form thereof, reference being had to the accompanying drawings in which- Figure 1 is a side elevation showing my improved device as it appears in use;. Fig. 2 is a plan of the same and Fig. 3 is a section taken on line 3-8 of Fig. 2 and Fig. 4 is a section taken on line 4-4 of Fig. 2.

The device itself comprises two duplicate plates 10 and 11, each having a V-shaped groove or channeled portion 12 down its center, which portions are adapted to register with each other in such a manner as to form a means for holding the valve stem 13. One of the plates, say the plate 10, carries two cutter bars 14 and 15 which are securely and permanently mounted upon the plate 10 by means of rivets 16, or any other suitable securing means. These rivets 16 also hold a pair of bracket members 17 by means of which the device is clamped in a vise 18 or the like.

The cutter bars 14 are so placed and held upon plates 10 that their two faces 14 and 15 lie in the same plane and lie substantially in a plane which passes through the center of the valve stem 13 when the valve stem is held in a position shown in Fig. 3. This relative position of the cutter bars is Specification of Letters Patent. Patented J an; 6, 1920.

1 Application filed April 8, 1918. Serial No. 227,212.

accomplished by, having one of the cutter bars, the one shown at 14', set in a channel or groove 18 formed in plate member 10.

The other plate 11 is detachable from plate 10 and is held in position by means of thumb nuts 19 on bolts 20. Plate 11 is in all substantial respects a duplicate of plate 10, having the channel or groove 18* on one side which fits over the cutter bar 15 and thus performs the office of holding the plate 11 in proper alinement.

The outer ends of cutter bars 14 and 15 are cut to the proper angle so that they each have a cutting edge 14 or 15 along the diagonal edge of the surface 14 or 15*. The angle is usually 45. These cutting edges l4 and 15 are formed as is best shown in Fig. 4, the surfaces of the bars behind the cutting edges being somewhat receding so that the cutting edges will take a slight bite into the surface of the valve. It will be seen that these two cutting edges 14 and 15 are opposite each other, in a common axial plane, and will cut into the seat surface 25 of the valve V when the valve is rotated in the direction indicated in Fig. 4. Rotation of the valve may be effected through the medium of any suitable tool; for instance, a screw driver held in a brace or other similar device. The cutter bars '14 and 15 are sufficiently wide to provide cutting edges 14 and 15 long enough to accommodate valves of different standard sizes. In practice I make my device so that it will accommodate all the difl'erent sizes of valves in common use on automobile engines.

A few turns of the valve against the cutting edges, longitudinal pressure being exerted on the valve meantime, causes the valve to be trued to proper circular shape. The plate 11 is adjusted so as to hold the valve stem accurately in position, and yet so as not to bind the valve stem.

As soon as the valve stem has been thus trued to proper shape, it is then placed on its seat and may then be easily ground into an accurate seat..

Having described a preferred form of my invention, I claim:

A valve truing device, comprising in combination a plate member having a central longitudinal V-shaped groove therein, a pair of cutter bars disposed longitudinally of the groove and on opposite sides thereof and permanently and rigidly mounted upon and connected with said plate member, said cutter bars heing mounted with their respec tWq said ctr-planar faces; another plate member havlng a similar longitudinal V-shaped groove adapted to register cver'the V-shaped grcove in the first mentioned plate member,

10 and "means to adjlistably held "the secb'nd mentioned plate member on the first mentioned plate member and to hold a valve stem "retatabl "in the two V-shaped grooves, t0. thusxhold the seat surface of a puppet valve in cutting engagement With the cutting ed es of said cutter bars. V

In vvitn ss that I claim the 'fefegoing I have'hreuntosubscribed my name this 30th day of March, 1918. v f

WIL'EIAM -S. ANDERSON. 

